Harrow-teeth



, UNITED STATES PATENT OFFICE.

WILLIAM WORKMAN, OF WEST DE PERE, WISCONSIN.

HARROW-TEETH.

SPECIFICATION forming part of Letters Patent No. 229,224, dated June 22, 1880.

Application filed May 15,1880. (Model) To all whom it may concern:

Be it known that I, WILLIAM WORKMAN, a citizen of the United States, residing at West De Pere, in the county of Brown and State of Wisconsin, have invented new and useful Improvements in Harrmv-Teeth, of which the following is a specification.

My invention relates to an improvement in vibratory tooth-barrows, its object being to simplify and cheapen the construction of this class of implements.

It consists, first, in a vibratory harrow-tooth head-block provided with a socket to receive a harrow-tooth and having its opposite edges converging toward its ends to form flat bearin g-surfaces adapted to rest and bear flatly against opposite walls of a receiving-mortise when said block is in either of its alternate positions. When blocks of this kind are provided with inserted teeth and pivoted in a mortise in a harrow-beam the entire strain of the draft upon the tooth-connection is endwise of the beam, and the flat bearings of the blocks upon the walls of the mortises in the direction of the grain, if the beam is of wood, entirely obviate all splitting strain, and all breaking and bending strain if the beam is formed of metal. Socketed tooth-blocks have heretofore been bolted snuglyin mortises in harrow-beams, and the strain of the draft is necessarily upon their corners and securing-bolts, sothat there is always also a transverse strain upon the beams, tending to split, break, or bend then].

My invention consists, secondly, in the combination, with a harrow-tooth, of a vibratory head-block provided with a socket to snugly receive the head of the tooth and having its opposite edges converging toward its ends to form flat bearing surfaces adapted to rest flatly against parallel mortise-walls when the said block is in either of its alternate positions, substantially as and for the purpose hereinafter set forth.

By this arrangement I greatly simplify and cheapen the construction of harrows, as is obvious at a glance.

In the accompanying drawings, Figure 1 represents a portion of a harrow-beam, partly in section, provided with two teeth, according to my invention. Fig. 2 is a view of a tooth and its holding-block connected, and Fig. 3 is a view of the same separated. Fig. 4. illustrates a modification of the invention.

The tooth-holding block A is formed of cast metal, with a longitudinal socket, 1), arranged obliquely. This block is somewhat thicker than the tooth, and is wider at its middle portion, 0, than at any other point, so that its longitudinal edges converge toward its end, and thus form flat bearing-surfaces d d and d d, which rest against the walls of the socket or mortise in the harrow-beam in both working positions of the tooth, as will be understood on reference to Fig. 1, in which the teeth are shown in vertical position or at right angles to the beam in full lines, and in inclined position in broken lines.

The length of the mortise c in the beam which receives the block is a little greater than the also lying partly in a recess, g, in one wall of the tooth-socket.

The teeth H are preferably rectangular in cross-section, and their heads fit snugly in the sockets formed for them in the blocks, each tooth having a recess, r, cut in one of its faces, and said recess coincides with the hole g and with recess g in the socket-wall when the tooth is inserted in the block, so that when so inserted and the block is placed in the mortise in the beam the bolt f lies partly in recess t and partly in recess g, and this prevents the tooth from being drawn out, so that a single bolt secures all the parts in position and forms the pivot of the block.

It will be understood that harrows provided with the teeth, as described, are intended for draft in both directions. When the harrow is drawn in the direction of the arrow 00 the teeth will stand at right angles to the beams, as shown in full lines, Fig. l, the bearing-surfaces (1 d of the block A resting flatly against opposite walls of the mortise, and when the harrow is drawn in the direction of the arrow -y the block will turn to theposition shown in It is to permit of this relative change of positions of the teeth, and at the same time preserve flat extended bearing-surfaces of the blocks in contact with the mortise-walls, that the toothsockets of the blocks are arranged obliquely.

It will be observed that there is very little strain upon the bolts,and no splitting strain upon the bearings, which may be made of wood.

When the teeth stand at right angles to the beams the barrow works in the ordinary manner for breaking up and placing the soil in condition, for planting; but when they are in their inclined position theiharrow can be used as a cultivator, and in going over corn, potatoes, &c., when they have first come up. the ground will be well pulverized, and the young plants will not be injured or uprooted.

In the modification shown in Fig. 4 the tooth H is provided with a projecting head, h, and the block A has formed in it a recess to receive the upper portion and head of said tooth, the same being required to be inserted sidewise. As the head holds the tooth from being drawn out longitudinally, there is no necessity that the tooth shall be provided with a recess to receive the boltf, and said boltis therefore provided with a hole through a solid portion of the block.

What 1 claim is.

l. A vibratory barrow-tooth head-block provided with a socket to receive a harrow-tooth and having its opposite edges converging to ward its ends to form flat bearingsurtaces adapted to rest flatly against opposite walls of a receiving-mortise when the said block is in either of its alternate positions, substantially as described, and for the purpose set forth.

2. The combination, with a barrow-tooth, of

I I I a vibratory head-block provided with a socket to snugly receive the head of the tooth and having its opposite edges converging toward its ends to form fiat bearing-surfaces adapted to rest flatly against oppositely-parallel mortise-walls when the said block is in either of its alternate positions, substantially as and for the purpose set forth.

3. The combination, with a barrow-beam provided with a suitable mortise, of a metallic block pivoted to vibrate in said mortise and provided with a socket to receive the head of a barrow-tooth, the said block having its edges formed to oppose fiat bearing-surfaces to opposite walls of the mortise when the said block is in either of its alternate positions, a harrow-tooth fitting in the socket of said block, and a single bolt passing through the harrowbeam, the vibratory block and tooth securing said parts together and forming the pivot of the said vibratory block, substantially as described.

4. The con'ibination, with the socketed vibratory block A, having its opposite edges converging toward its ends and provided with the bolt-hole g and the recess 1' in its socketwall, of the barrow-tooth having the recess i formed in its face, to coincide with said hole g and recess 9, and a suitable bolt fitting said hole and recesses, for securing said block and tooth together, substantially as described.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

WVILLIAM WORKMAN.

WVitnesses W. M. W ORKMAN, H. H. HURD. 

